Raising and lowering means in metal-working machinery



A. E. ROBINSON AND H. w. SCHATZ.

RAISING AND LOWERING'MEANS IN METAL WORKING MACHINERY.

I I i I APPLICATION FILED SEPT-10,19l7- 1 ,38() ,021 Patented May 31,1921.

A. E. ROBINSON AND H. W. SCHAIZ. I

RAISING AND L OWERING MEANS IN METAL WORKING MACHINERY.

APPUCATION FILED SEPT. 10, 1917.

1,380,021. Patented May 31,1921.-

' 2 SHEEIS SHEET Z- ment with the arm,

ET srr "tart w n 1 ALBERT E. ROBINSON, or cINcINNATI, awn-"HERMAN w.,soiia'rz, orf onwoon,

' OI-IIO. P '1 RAISING AND LOWERING MEANS IN MnraL-wonKINe lineme IApplication filed September 10, .1917. v Serial No. 190,657.

To all to 710m it may concern:

Be it known that we, ALBERT E. ROBIN- soN and IIERMAN SoHA'rz,citizensof the United States, residing, respectively, at Cincinnati, andat. Norwood, in the county of Hamilton and State of Ohio, have-jointlyinvented certain new and useful Improvements in Raising andLowering'Means in Metal-Working Machinery, ,of which the following is aspecification.

Our invention relates to means for raising and lowering a substantiallyheavy, part of a metal working machine on a support or column, and ithas for its object the provision' of novel means whereby breakage, dueto carelessness or abnormal loads, is avoided. We have exemplified ourinvention as employed in a so-calleddrilling machine, for raising andlowering the drill-arm on the column. Themeans for efi'ectingsuchraising and lowering, or adjustment of the arm toelevation on thecolumn, is exemplified as a screw-rod which has threaded engageand isarranged to be direction by means of gearing. .The. arm is arranged tobe fixed to the column in its adjusted, positions. When so clamped, thearm is rigid with the column. If now an. attempt should be made underusual structures as heretofore .made, to raise or to lower the arm whilethe same is clamped to the'column, the operating parts would besubjected to excessive stress with the practical certitude of breakageof parts or stripping of gears. I 1 3 It is the'object ofour inventionto avoid these objections, and to provide. means which perform theirpower transmitting function under normal loads and yield to. abnormalloads; further to provide yielding pressure means for such means; and,further, to provide means for adjusting the pressure.

rotated in reverse It is a further object of our invention to Vprovide-novel means for absorbing shocks or suddenstresses in theraising and lowering mechanism of the, character mentioned, as when thedirection of movement of the raising and lowering mechanism is reversed,or the power thereof suddenly applied for effecting a change ofelevation of the supported part.

The invention will be further readily understood from the followingdescription which operates and claims, and from the drawings, inwhichlatter: 'l 1 Figure 1 is afront a ate. era (i-na machine embodying ourinvention, .-and partly broken away. I;

Fig. 2 is a rear elevation of the same. Fig. 3 is a plan view -ofourgimproved device applied manta Ma er, ieeri' in adrillingzmachine,the

latter partly broken away,- and thetop gearcover removed.

. Fig. 4 is ,ayve'rtical-section of tihe same, taken in the .plane ofthe line 4+-4of Fig. 3.

Fig. 5 is averticalsection-ofthe-same,

taken in the plane of the line 5- 15 of The drillingmachine, exemplifiedas embodying our 1 invention, is shown as 'aradial drilling ma ehine, gincluding' a. base 11, from cylindrical-column, column be ng supported Iand rotatable 1n any ordinary Orwell-known manner, 1 and Fig.3;

arranged to be clampedinfadjusted positions 1 3 tothe clamp 14., Thecolumn mayrepresentany suitable support. An-arm 15 is adjustable toelevation on the column and has, a bearing 16 about'the column.

post or base; by means of ausual j j Thearmmayrepresent any suitablebracket.v When in adjusted position, ,the -bearingv is arranged-rte be 4clamped in fixed relation to the column by usual clamps v 17.

the arm, as by means of a ,hand-wheelflil,

a suitable pinion meshing with a rackz20 extendinglengthwise}of the arm,the drill-head beingslidable laterally has a "suitable drill-spindlerotatably driven and axially feedable on theidrillhead. It .may. have. asuitable tool, as a tothe table 25.

on the arm on *guideways 21. The drill-head 7 drill-arm on the col- 2 gumn, Inthe present. exempln'ication, being ll y perate l be v shaftextending lengthwisejof the drill.- arm, having usual operativeconnection with the drill-spindle for'rotatively' driving and forfeeding the same. The shaft 31 has 'a' 70 which a post 12extendupwardlmthe post having a colu'mn'lS, shown as"a =rotat able receivedthereabout, the

I a drill-head 18-is adjustable laterally-ion i housing and in suitablei on a power bevel-gear 32 fixed thereon, which meshes with thebevel-gear 33 rotatable in and held axially to a bearing 34 on thedrill-arm, an upright shaft 35 having spline-connection 36 with saidbevel-gear 33.

The upright shaft is journaled in a bear-' ing 37 in the column and abearing 38 in a cap and gear-housing 39 fixed to the upper end of thecolumn, as by set-bolts 40. A gear 41 is fixed to the upper end of theupright shaft and meshes with a gear 42, which rotates with a gear 43,the gears 42, 43, being keyed together by a key 44. The gears 42, 43,rotate on a stud-shat 45 fixed in a bearing 46 of the gear-housing, asby a set-bolt 47. The gear 42 meshes with a gear 48, fixed to theupperend of a shaft 49, journaled in a bearing 50 in the gearbearings inthe post 12, and having a bevel-gear 51 at its lower end, which ismeshed by a bevel-gear 52, shaft 53, arranged to be rotated at selectivespeeds, as by means of a steppulley 54.

The means for adjusting the arm to elevation on the column areexemplified as a screw-rod 61, which has threaded engagement with thearm, as by means of a nut 62, received in a recess 63 in the arm, thearm finding support onthe nut by means of an annular ledge 64 of thearm, the nut being fixed non-rotatively to the arm by means of aset-bolt 65. The lower end of the screw-rod may be journaled in abearing 66 on the column. The upper end of the screw-rod is receivedthrough a bushing '4" 1, located in a bearing 72 of the gear-housing 39.The bushing has a shoulder 7 3, whereby it has support on the bearing,and an enlarged journal-part 75. A collar 77 is received about thescrew-rod, being pinned thereto by a pin 78,-the collar-bearing.

lower end of the bearing 7 2. A

against the I 81 is provided for the supporting bearing screw-rod abovethe bushing 71, this supporting bearing being exemplified as aballbearing, an end-thrust collar'82 resting on the ball-bearing andhaving threaded engagement 83 with the screw-rod. The endthrust bearingmay be pinned to the screwrod by a pin 84.

Collars 86, 87, are received about the screw-rod, the axes of'rotationof the collars being comcident'with the axis of rotation of thescrew-rod. The collars are rotatively fixed to the screw-rod, as byhaving spline-connection 88 therewith. Bela tive axial movement ispermitted between the collars. The respective collars havefriction-flanges 91, 92; A gear 93 is provided with an inner frictionfiange 94 received between the frictionfianges 91, 92. The gear has acentral bore 95, the wall of which bears on the annular hubs 96 of saidcollars'86, 87. Friction washers 92'', 98, are

received between the triction fiange on the gear and the frictiomfiangeson the respec tive collars. The washers are axially positioned withrelation tothe fiangesby being provided with central bores 99 in whichsaid hubs" are received.

The gear 93 meshes with a gear 101 journaled on a stud-shaft 102 securedin a bearing 103 of an arm 104 of a rocking lever 105. A gear 106 isfixed tothe upright shaft 49 and in the present exemplification rotateswith the gear 48. The gears 43, 106, rotate in opposite directions, efiected by rotation of the gear 106 by the shaft 49, the rotation of thegear'48 with gear 106, the meshing of the gear 48 with the gear 42, andthe rotation; of the gear 43 with the gear 42. V

' The gears 43, 106, 42, and '43, normally rotate. The gear 101is'normally out of mesh with both the gears 43 and 106, When broughtinto meshing relation with one of said gears, the gear 101 is rotated inone direction, for rotating the screw-rod in a given direction, andlowering the arm on the column. When the gear 101 is caused to mesh withthe other of said gears, the gear 101 is rotated in the oppositedirection, the screw-rod being oppositely rotated, and the arm raised onthe column.

It is necessary to unclamp the bearing of the arm about the column priorto the raising or lowering of the arm. Sometimes, due to carelessness,the operator attempts to raise or to lower the armvwithout unclampingthe bearing. Tn case this is done breakage of parts or stripping ofgears in my improved device is prevented, by the fact that the gear 106is permitted to yield with relation to the'screw-rod through the mediumof the friction devices coacting therewith.

. The rocking lever 105 comprisesthe arm 104, to which the stud-shaft102 is secured for carrying the gear 101, and an arm 111 which is anoperating arm. The rocking lever has a bearing 112 about the enlargement75 of the bushing 71. The rocking lever is operated by means of arocker-rod 115, journaled at its lower end in a bearing 116 of thecolumn, and at its upper end in a bearing 117 in the gear-housing 39.The rocker-rod is provided with'a handle 118 extending radiallytherefrom for rocking the rod. A segment-gear 121 is secured to therocker-rod at its upper end, this segment-gear meshing with asegment-gear 122 on the operating arm ofthe rocking lever. In order to'efi'ect rocking movement 01. the rocking lever to proper extent toobtain proper meshing relationbetween the gear 101 and the respectivegears 43 and 106, means are provided for limiting the rocking movemen ofthe rocker-rod, accomplished by providing the segment-gear 121 with lugsI23, thr'0ugh which set-b'olts124; extendgact ingas stops; the set-boltsbeing adjustable in said lugsand clamped'in adjustediposi tions bymeansof jam' nuts 125. The pro ments; the spring being-receivedaboutfanj upper threaded end I32'0f the' screw ro'd and man annularrecess 133-of a nut -13{t.thread+ ed to said threadedendforiadjusting-f' the tension-'ofthe spring. Ajam-bolt 135 is receivedthe threaded bore of the me I andis arranged'to 'impinge' the. upper endof the screw-rod for "locking." the nut in I a djuste'd' position. Thenut and 'jamrbolt-i are received through an aperture 136- inllthegear-cover 137,5 so that'the same-"may be adjusted from the outsideofthe machine. i y meansof our improved device aresili ent pressure isapplied. to'the frictionele; ments, for causing the" same to: act: undernormal pressures or'wloads and preventing an undesirable slippagebetweeni the --fric'- tion elements, and insuring the coactionof thefriction elements duringnonnal loads. The degree of resistance of thefrictiofnelee ments is adjusted by means of the-adjustment of thespring, .so that the resistance under .which the friction: elements. 11shall yield; maybe adjusted inraccordance'with theloadit is desiredt-hatthe 'frictioni'ele ments shall move. j The spring further aids the"friction-elementsin acting as a cushion in theipower transmission to thescrew-rod, and in absorbing the shocks incident to initiating movementin the screw-rod, and occasioned by reversals 1 of, rotation thereof,andfcom- 'pensates' for suddenstresses therein.

If now an attempt be made-to raise or lower the armduringclamped-relation of the bearing thereof about.thezcolumn, the frictionelements will yield so asr'topre: vent injury ofthe'partsj .or strippingof teeth of the gears. If, furthermore,-itheatytempt be made toimpartsuddenrotation'to the screw-rod for instance in raisingrthe arm,resulting instress upon the partsor the teeth of the gears; in excess ofthe load contempl ated for the] same, the friction elements will yielduntil the resistance. thereof overcomes the inertiaof rest of the loadand initiates the movement'of the load with out shock. I Q. Having thusfully described ouryz-invention, what we claim as new and-desire tosecure by Letters Patent, is.

1. In a metal working machine, 13116100111 bin-ation of'a' support, apart: adjustable to elevation. thereen and means for: adjusting.-

tien' member between said driving member resilient means acting on'saicl pagrt to elevation comprising friction transmitting .means;arranged to transmit normal loads and toyield-to -abnormalfloads,

and neansfo'rsupporting said .partiinder pendent of'the frictioncontact. of said frie -m1tting means arranged-to. transmit undernormal'loads and to yield to; abnormal loads, means: for supporting saidpart, duringkad+ justn entslof i said: part, independent of. the

friction contact of said friction transmitting meanafandirieans for'adjustin-g the :t 'ransmitting effect of, friction transmitting means.n 31min aimetal Workingmachme, the comele nation therecmmean's foradjusting said part; to: ielevation acompnsing a friction transmitting,means arrangedgto transmit undernormal loads'and t-oyieldto abnormaleloads, means-rfor supporting said; part independent; of. the frictioncontactinsaid friction transmitting means I during; I adj ust ine'ntsJofsaid. pfa'rt,- and; yielding pressure means for cushioningsaid-frictiontransmit! tingzmeansm at In a :metal working machine; the oombinationefasupport,fa partiadjustable to bination of-;a;-.col'umn;1 an. arm,meansfor raising and lowering-said-earmpn said 091% ,umn compr singa nutnon-rotatively'ifixed,

to said arm, an upright screw axially held and-rotative with relation tossaid cclumln saidscrew constituting .a' driving member,

power-'tnansmitting fric a; driven member,; a

and: saiddrivenmember arranged to yield to xabnormalaload and to causedriving relation between saiddriving driven member under normal, loads}and said power-trans,- mitting friction member raising'and lowering;means.-5a a 5. 111 a" metal workingmachine, the com.- binati-on of-acolumn; ail-harm, meanszfor raisingrandlowering'said arm onsaid column;comprising a nut non rotatively *fixed .te-said arm, an upright screwaxially-held and rotative with relation to said column, a" drivingmember, Said "screw constituting a? driven member, a power transmittingfrici tien-Zmember between said driving member and saiddiiven memberarranged toqyield to abnormal load and to cause driving 'rela tion;between said driving member "and said driven member under normal load,resilient meansacting on said power transmitting friction member tocushion said-raising and lowering means, and means for adjusting "said;resilient means. u .5.. 111a; metal, working machine, the'com member andsaid a bination of a column, an arm adjustable to elevation thereon,means for clamplng said arm to said column in ad usted positions andmeans for'adjusting said arm to eleva' tion on said column comprisingfriction means including a driving member, a driven member and afriction member therebetween, and a coacting screw and nut.havingelevating and lowering-efiect .on said arm, said coacting-screwand nut supporting said arm against 'gravity'indepe'ndent of the Ifriction contact in said friction means, arranged to yield duringclamped relation of said arm on said column and to adjust said arm onsaid column during unclamped relation of said arm.

7. In a metal working machine, the combination of a column,-an armadjustable to elevation thereon, an upright screw-rod extendinglengthwise of said 'column having threaded engagement with said arm forraising and lowering the same, a supporting bearing for said screw-rod,an end-thrust collar fixed to said screw-rodand supported by saidsupporting bearing, means for rotating said screw-rod comprising a gearwhose axis of rotation is coincident with the axis of rotation of saidscrew-rod, a collar rotatable with said screw-rod, and friction meansbetween said "gear and collar arranged to rotate saidi screw-rod =undernormalloads on said screw-rod and to yield to abnormal loads on saidscrew rod, said end-thrust bearing sup-porting said screwrod independentof the friction contact in said friction means. Y

8. In a metal working machine, the combination of a column, an armadjustable to elevation thereon, anupright screw-rod extendinglengthwise of said column having threaded engagement with said arm forraising and lowering the same, a supporting bearing for said screw-rod,an endthrust collar fixed to said screw-rod and supported by saidsupporting bearing, means for rotating said screw-rod comprising a gearwhose axis of rotation is coincident with theaxis of rotation of saidscrewrod, a collar rotatable with said screw-rod, friction means betweensaid gear and collar arranged to rotate said screw-rod under normalloads on said screw-rod and to'yield to abnormal loads on saidscrew-rod, and means for adjusting the friction resistance betweensaidgear and collar, said end=tlirust bearing supporting said screw-rodindependent of the friction contact in said friction means.

9. In a metal working machine, the combination of a column, an arm:adjustable to elevation thereon, an upright screw-rodextendinglengthwise of said column having threaded engagement with saidarm for raising and lowering the same, a supporting bearing for saidscrew-rod, an end-thrustwhose-axis of rotation is coincident with theaxis of rotation of said screw-rod, a collar rotatable with saidscrew-rod, means between said gear and collar arranged to rotate saidscrew-rod under normal loads on said screw-rod and to yield to abnormalloads on said screw-rod, and means comprising a spring actingyieldinglyon said friction means for cushioning said friction means, saidend-thrust bearing supporting said screw-rod independent of the frictioncontact in said friction means. 10. In a metal working machine, thecombination of a column,'an arm adjustable to elevation thereon, anupright screw-rod extending lengthwise of said column havingthreadedyengagement with said arm for adj usting said arm to elevationon said column, a supporting bearing in which said screwrodisljournaled, an end-thrust collar fixed to said screw-rod and supportedby said supporting bearing, a gear about said screwrod whose axis ofrotation is coincident with the axis'of rotation of said screw-rod,opposed collars' arranged to rotate with said screw-rod and havingrelative movement be tween them axially of said screw-rod, said gearprovided with an annular flange received between said collars, frictionwashers between said flange and each of said collars, and resilientmeans causing coaction between said fiange, said collars and saidfriction washers, and said end-thrust collar sup porting said screw-rodindependent of the friction contact in said friction means.

11. In a metalworking machine, the com bination of a column, an armadjustable to elevation thereon, an upright screw-rod ex tendinglengthwise of said column having threaded engagement with said arm foradj usting said arm to elevation on said column, a supporting bearing inwhich said screwrod is journaled, an end-thrust collar fixed to saidscrew-rod and supported by said supporting bearing, a gear about saidscrew- 'rod whose axis of rotation is coincident with the axis ofrotation of said screw-rod, opposed collarsarranged to rotate with saidscrew-rod and having relative movement between them axially of saidscrew-rod, said gear provided with an annular flange received betweensaid collars, friction washers between said flange and each of saidcollars, resilient means causing coaotion between said flange, saidcollars and said friction washers, means for adjusting the pressure ofsaid resilient means, and said end-thrust bearing supporting saidscrew-rod independent of the friction contact in said friction means. I

12. In a metal working machine, the combination of a column, an armadjustable to 130 elevation thereon, means for clamping said arm to saidcolumn, an upright rotatable screw-rod having threaded connection withsaid arm for raising and lowering said arm on said column, a bearing forsaid screw-rod for supporting said screw-rod in the direction of itsaxis, an end-thrust collar fixed to said screw-rod and supported by saidsupporting bearing, opposed collars rotatable with said screw-rod andhaving axial movement between them, a gear provided with an irmerannular flange received between said collars and having an axis ofrotation coincident with the axis of rotation of said screwrod,friction-members between said flange and each of said collars, means forexerting yielding pressure on said frictionemembers, means for rotatingsaid gear in reverse discrew-rod through the medium of said frictlon-members'during unclamped relation of sald arm, and saidfriction-members permitting rotation of said gear with relation to saidscrew-rod during clamped relation of said arm to said column, and saidend-thrust bearing supporting said screw-rod independent of the frictioncontact in said friction means.

In testimony whereof, we have hereunto signed our names in the presenceof two subscrlbing witnesses.

ALBERT E. ROBINSON. HERMAN W. SCHATZ. Witnesses: I

CLAYTON H. CoRMANY,

MABEL Hmsr.

